using System;
using System.Threading;
using iTextSharp.tool.xml.pipeline.ctx;
using iTextSharp.tool.xml.exceptions;
/*
 * $Id: CssResolverPipeline.java 154 2011-06-06 14:50:14Z redlab_b $
 *
 * This file is part of the iText (R) project.
 * Copyright (c) 1998-2014 iText Group NV
 * Authors: Balder Van Camp, Emiel Ackermann, et al.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License version 3
 * as published by the Free Software Foundation with the addition of the
 * following permission added to Section 15 as permitted in Section 7(a):
 * FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
 * ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
 * OF THIRD PARTY RIGHTS
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU Affero General Public License for more details.
 * You should have received a copy of the GNU Affero General Public License
 * along with this program; if not, see http://www.gnu.org/licenses or write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA, 02110-1301 USA, or download the license from the following URL:
 * http://itextpdf.com/terms-of-use/
 *
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU Affero General Public License.
 *
 * In accordance with Section 7(b) of the GNU Affero General Public License,
 * a covered work must retain the producer line in every PDF that is created
 * or manipulated using iText.
 *
 * You can be released from the requirements of the license by purchasing
 * a commercial license. Buying such a license is mandatory as soon as you
 * develop commercial activities involving the iText software without
 * disclosing the source code of your own applications.
 * These activities include: offering paid services to customers as an ASP,
 * serving PDFs on the fly in a web application, shipping iText with a closed
 * source product.
 *
 * For more information, please contact iText Software Corp. at this
 * address: sales@itextpdf.com
 */
namespace iTextSharp.tool.xml.pipeline.css {

    /**
     * This IPipeline resolves CSS for the Tags it receives in
     * {@link CssResolverPipeline#open(Tag, ProcessObject)}
     *
     * @author redlab_b
     *
     */
    public class CssResolverPipeline : AbstractPipeline {

	    private ICSSResolver resolver;

        public override IPipeline Init(IWorkerContext context) {
            try {
                ObjectContext<ICSSResolver> mc = new ObjectContext<ICSSResolver>(resolver.Clear());
                context.Put(GetContextKey(), mc);
                return base.Init(context);
            } catch (CssResolverException e) {
                throw new PipelineException(e);
            }
        }
	    /**
	     * @param next the next pipeline.
	     * @param cssResolver the {@link CSSResolver} to use in this IPipeline, it
	     *            will be stored in a ThreadLocal variable.
	     */
	    public CssResolverPipeline(ICSSResolver cssResolver, IPipeline next) : base(next) {
            this.resolver = cssResolver;
	    }

	    /**
	     *
	     */
	    public const String CSS_RESOLVER = "CSS_RESOLVER";

	    /*
	     * (non-Javadoc)
	     *
	     * @see com.itextpdf.tool.xml.pipeline.IPipeline#open(com.itextpdf.tool.
	     * xml.Tag, com.itextpdf.tool.xml.pipeline.ProcessObject)
	     */
	    public override IPipeline Open(IWorkerContext context, Tag t, ProcessObject po) {
		    ((ObjectContext<ICSSResolver>)GetLocalContext(context)).Get().ResolveStyles(t);
		    return GetNext();
	    }

	    /**
	     * Stores the cssResolver for the calling thread.
	     *
	     * @param resolver the CSSResolver to use.
	     */
	    virtual public void SetResolver(ICSSResolver resolver) {
		    this.resolver = resolver;
	    }
    }
}
